Given function g is defined by g:x --> 2x^2 -8x+11 where x < or equal to A WHERE A IS A CONSTANT

(a)state the largest value of A which g has an inverseWho know how to do this question?!?!?!?!?!!?

That the function has an inverse requires that there be one and only one solution that gives the value , and then As g(x) is a quadratic this is the case as long as , where is the lowest point on the graph of